<?php
/**
 * Zend Framework
 * LICENSE
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 * @category Zend
 * @package Zend_Cache
 * @subpackage Zend_Cache_Backend
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 * @version $Id: Disk.php 24593 2012-01-05 20:35:02Z matthew $
 */
/**
 *
 * @see Zend_Cache_Backend_Interface
 */
require_once 'Zend/Cache/Backend/Interface.php';
/**
 *
 * @see Zend_Cache_Backend_ZendServer
 */
require_once 'Zend/Cache/Backend/ZendServer.php';

/**
 *
 * @package Zend_Cache
 * @subpackage Zend_Cache_Backend
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 */
class Zend_Cache_Backend_ZendServer_Disk extends Zend_Cache_Backend_ZendServer implements Zend_Cache_Backend_Interface {

    /**
     * Constructor
     * @param array $options associative array of options
     * @throws Zend_Cache_Exception
     */
    public function __construct (array $options = array()) {
        if ( ! function_exists ('zend_disk_cache_store')) {
            Zend_Cache::throwException ('Zend_Cache_ZendServer_Disk backend has to be used within Zend Server environment.');
        }
        parent::__construct ($options);
    }

    /**
     * Store data
     * @param mixed $data Object to store
     * @param string $id Cache id
     * @param int $timeToLive Time to live in seconds
     * @return boolean true if no problem
     */
    protected function _store ($data, $id, $timeToLive) {
        if (zend_disk_cache_store ($this -> _options['namespace'] . '::' . $id, $data, $timeToLive) === false) {
            $this -> _log ('Store operation failed.');
            return false;
        }
        return true;
    }

    /**
     * Fetch data
     * @param string $id Cache id
     */
    protected function _fetch ($id) {
        return zend_disk_cache_fetch ($this -> _options['namespace'] . '::' . $id);
    }

    /**
     * Unset data
     * @param string $id Cache id
     * @return boolean true if no problem
     */
    protected function _unset ($id) {
        return zend_disk_cache_delete ($this -> _options['namespace'] . '::' . $id);
    }

    /**
     * Clear cache
     */
    protected function _clear () {
        zend_disk_cache_clear ($this -> _options['namespace']);
    }

}
